EP1997202B1 - Electro-mechanical actuator system, for instance for adjustable furniture - Google Patents

Electro-mechanical actuator system, for instance for adjustable furniture Download PDF

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Publication number
EP1997202B1
EP1997202B1 EP07711262.1A EP07711262A EP1997202B1 EP 1997202 B1 EP1997202 B1 EP 1997202B1 EP 07711262 A EP07711262 A EP 07711262A EP 1997202 B1 EP1997202 B1 EP 1997202B1
Authority
EP
European Patent Office
Prior art keywords
temperature
electro
actuator system
control unit
mechanical actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07711262.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1997202A2 (en
Inventor
Jeppe Christian Bastholm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linak AS
Original Assignee
Linak AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38293240&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1997202(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Linak AS filed Critical Linak AS
Priority to PL07711262T priority Critical patent/PL1997202T3/pl
Publication of EP1997202A2 publication Critical patent/EP1997202A2/en
Application granted granted Critical
Publication of EP1997202B1 publication Critical patent/EP1997202B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/005—Circuits arrangements for indicating a predetermined temperature

Definitions

  • the present invention relates to an electro-mechanical actuator system for instance for adjustable furniture as stated in the preamble of claim 1.
  • This type of actuator systems is for instance known from WO 02/29284 A1 to Linak A/S, WO 01/17401 A1 to Linak A/S and WO89/10715 A1 to Dewert concerning a linear, a rotary- and a dual actuator, respectively.
  • Actuator systems especially for height-adjustable tables are also known, cf. for example WO 02/39848 A1 to Linak A/S and EP 1 079 511 A1 to Linak A/S, concerning a linear actuator and a power supply/control unit, respectively.
  • thermal fuse which cuts off the current to the motor if the temperature exceed a predetermined critical temperature is often mounted in connection with the transformer, cf. for instance DE 200 08 192 U1 .
  • a problem with thermal fuses is that successive damages can be inflicted on the rest of the control unit before the fuse is activated.
  • the purpose of the invention is to provide a more accurate and effective protection from superheating.
  • the electro-mechanical actuator system is constructed according to claim 1, where the power supply and/or the electric control unit comprises at least one thermal diode, where the voltage is inverse proportional to the temperature and calibrated so that a given voltage is converted into a given temperature, and where the control unit is arranged so that the current for the motor of the actuator is cut off at a predetermined critical temperature.
  • Diodes are small, inexpensive and relatively accurate components which can be mounted on a circuit board, and they can be located where the temperature conditions are expected to be critical. To begin with, it is decisive that the current for the motors are cut off if a superheating should occur, so that successive damages also to the actuator system are avoided.
  • the voltage over the diode is not directly used, but is used for a pulse generator which is traced by a micro processor. However the voltage over the diode still determines the cyclic time. A long period corresponds to a low temperature while a short period corresponds to a high temperature.
  • the micro processor measures the cyclic time at start-up (for instance tests during production), and uses it as basis. The temperature is hereafter calculated as a change in the cyclic time.
  • the basic defects and the variations of the diodes are hereby removed from the tracing system.
  • a special advantage by the invention is that a random number of diodes can be coupled in parallel, which in that way provides more measuring points - an extra measuring point is merely a diode at a moderate cost. It is of course not possible to distinguish between the individual diodes but normally it does not matter where the system is too hot as it will shut down anyhow.
  • the embodiment shown in the drawing comprises four diodes D1,D2,D3,D4, arranged in parallel, connected to a power source and connected with a multimeter.
  • the diodes are located strategically in the actuator system, where the system is traditionally known to be superheated as a result of overload, also as a result of defects. Such a strategic location can for instance be in connection with FET-transistors for controlling the actuator. If the area surrounding for instance the diode D2 becomes hotter than the area surrounding the other diodes, the voltage will fall as a result of the fact that the resistance in the diodes falls. This is recorded by the multimeter V, and on the basis of this signal the current for the motor can be cut off.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Electric Motors In General (AREA)
  • Protection Of Generators And Motors (AREA)
EP07711262.1A 2006-03-09 2007-03-09 Electro-mechanical actuator system, for instance for adjustable furniture Not-in-force EP1997202B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07711262T PL1997202T3 (pl) 2006-03-09 2007-03-09 Elektromechaniczny układ siłownikowy, na przykład do regulowanych mebli

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200600335 2006-03-09
PCT/DK2007/000119 WO2007101446A2 (en) 2006-03-09 2007-03-09 Electro-mechanical actuator system, for instance for adjustable furniture

Publications (2)

Publication Number Publication Date
EP1997202A2 EP1997202A2 (en) 2008-12-03
EP1997202B1 true EP1997202B1 (en) 2013-09-11

Family

ID=38293240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07711262.1A Not-in-force EP1997202B1 (en) 2006-03-09 2007-03-09 Electro-mechanical actuator system, for instance for adjustable furniture

Country Status (5)

Country Link
EP (1) EP1997202B1 (pl)
CN (1) CN101401271B (pl)
DK (1) DK1997202T3 (pl)
PL (1) PL1997202T3 (pl)
WO (1) WO2007101446A2 (pl)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55146954A (en) * 1979-05-02 1980-11-15 Nec Corp Protective circuit for protecting semiconductor device against thermal breakage
EP1079511A1 (en) * 1999-08-26 2001-02-28 Linak A/S Power supply for DC-motors
DE20008192U1 (de) * 2000-05-06 2000-08-10 OKIN Gesellschaft für Antriebstechnik mbH & Co. KG, 51645 Gummersbach Bedienungssystem für ein Sitz- oder Schlafmöbel
US6838847B2 (en) * 2002-05-09 2005-01-04 Siemens Vdo Automotive Inc. Stall protection based on back EMF detection
US7334418B2 (en) * 2004-02-12 2008-02-26 Via Technologies, Inc. Method and apparatus for microprocessor temperature control

Also Published As

Publication number Publication date
WO2007101446A2 (en) 2007-09-13
PL1997202T3 (pl) 2013-12-31
WO2007101446A3 (en) 2007-12-06
EP1997202A2 (en) 2008-12-03
DK1997202T3 (da) 2013-10-28
CN101401271A (zh) 2009-04-01
CN101401271B (zh) 2011-06-08

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